The Nineteenth Byte

Leaky Nun

19:01

0

Pyth, 5 bytes x1iLQ Try it online! How it works Note that Pyth uses 0-indexing. x1iLQ Q = eval(input()) x1iLQQ implicit Q at the end iLQQ [gcd(Q,0), gcd(Q,1), ..., gcd(Q,Q-1)] x1 all occurences of 1 in the above list (return their indices)

New Main Posts

-1

Q: Code Golf - Loop through RAM

To keep this short, this requires writing a for loop to print every byte of ram to the console. (This is my first code-golf, so let me know if I messed up.)

code-golf c#

Riker

@LeakyNun oh taht's me

I was reading TNB, was like "oh, cool answer"

didn't even occur to me that's my own question

:p

@flawr I can't remember whether I pinged you with this gif yet, but I don't think so:

i.imgur.com/Y0pPCo6.gifv

it's a espresso

betseg

19:20

an?

ETHproductions

I like how the original five streams gradually merge into two

betseg

I like how the original five hundred streams gradually merge into two

opensource.google.com/projects/vim-plugins Google's Vim plugins

PSA:

122

Q: Brief outage planned for Wed, May 3, 2017 at 8pm US/Eastern (00:00 UTC) (like a fire drill for computers)

MicroVersion: Planned service degradation: All Stack Overflow/Stack Exchange sites read-only for 20 minutes on Wed, May 3, 2017 shortly after 8PM US/Eastern (midnight UTC). If you blink, you'll miss it. Short version: There will be a service degradation for up to 20 minutes shortly after 8PM US...

discussion featured announcements

Dennis

20:09

@Riker It's also a 27 MB GIF. ಠ_ಠ

Riker

apologies, I try to gauge by how fast they load, and it was pretty fast for me

must have been cached or something

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Compress playing cards (work in progress) kolmogorov-complexity First, let us define a deck of 52 standard playing cards: Ace, Jack, King, Queen, 1, 2, 3, 4, 5 ,6 7, 8, 9, 10, and each card has four suits: Clubs, Diamonds, Hearts, Spades, and thus 13 x 4 = 52 Your task is to devise the smalles...

Downgoat

20:23

Question: Is there a good way to use a python/C/C++ library form ruby?

I can write a binding and all but I don't really have any idea how to do

Jan Dvorak

the keyword to research is "foreign function interface"

Phoenix

jruby can run Java libraries

Conor O'Brien

isn't ruby written in C?

ETHproductions

> JRuby is a high performance, stable, fully threaded Java implementation of the Ruby programming language.

Phoenix

Right, mri ruby can run mri ruby libraries, jruby can run jvm and jruby libraries.

Though all the big mri libs have been ported to jruby

Downgoat

20:28

Can jruby do rails and all? Is it a full implementation

Phoenix

Yeah, rails was fully ported

Jruby is generally faster since it compiles to jvm while mri is interpreted, but it uses orders of magnitude more memory.

Jan Dvorak

Then there's Crystal

Basically a typed and compiled dialect of Ruby

Phoenix

Crystal is its own lang

Downgoat

Ugh. Whose brilliant idea was it to make python untyped

Jan Dvorak

similar to Ruby, though

Phoenix

20:31

But can it run Rails?

Downgoat

What about Python <-> Ruby interfacing?

ETHproductions

Is there any way to force SE to save a draft of an answer?

flawr

@Riker espresso = caramel = lava confirmed.

Phoenix

@Downgoat There's a library just called rubypython that does that iirc

Riker

@flawr yep

Phoenix

20:33

@Downgoat goto.info.waseda.ac.jp/~fukusima/ruby/python/doc/index.html

trichoplax

@ETHproductions I usually find it saves a draft of at least one post, but I'm not sure it can be relied upon so I usually save the draft externally to be sure. I don't know of a way to force it, it just seems to save periodically

Downgoat

Question: has anyone by any chance dealt with HDF file format before?

Phoenix

Nope

New Meta Posts

3

Q: Sort answer chaining questions by newest by default

answer-chaining-tagged questions should be sorted newest to oldest by default. It is disorienting to see them out of order because they are sorted highest to lowest votes. Agreed?

discussion feature-request answer-chaining

Phoenix

^ has more stars than upvotes

Downgoat

20:47

@Phoenix do you know if it uses python bindings or spawns an entire python process

Phoenix

99% sure it's a python interpreter in Ruby

So yes, it spawns an entire python process

betseg

@ETHproductions which is written in C?

Phoenix

Which is written in Java. Obviously?

betseg

i meant the JVM

ETHproductions

Technically then everything is written in machine code :P

betseg

20:51

no, GCC is written in C and C++, PyPy is written in Python, etc

ETHproductions

But JRuby is written in Java. It doesn't matter that Java is written in C

Python is written in C, for heaven's sake

betseg

yeah and that. too. also TIL than Oracle's JVM is written in C++

ETHproductions

Well, CPython is anyway

Phoenix

I know OpenJDK is C++, but where'd you see Oracle's JDK is in C++ and not C?

betseg

30

Q: What programming language is used to develop Java?

I was asked in the interview what programming language was used to implement Java. I was stunned: I never thought of this. I only know the core Java classes are in Java. What programming language is used to develop Java?

java

Phoenix

20:54

@betseg You know, some poor saps had to write the first C compiler in assembly.

betseg

BCPL?

as i thought, BCPL: stackoverflow.com/a/18126181/3312910

Phoenix

Ah

betseg

did someone actually write single bytes for the first assembly to machine code compiler?

Phoenix

My dad says yes, but I can't tell if he's just telling my horror stories of ye olden days.

But the internet says that no, first they wrote an incredibly simple proto-assembly, which they used to bootstrap writing more complicated assemblers, until something mostly usable for actual work was created.

betseg

but still, someone had to write single bytes for that proto-assembler

Phoenix

21:03

Yep

betseg

seems terrifying

trichoplax

At least the computers were programmable at that point, so you didn't have to rewire it each time you wanted to do something different

Phoenix

All it had were probably jnz, mov, and a command to write the output somewhere.

Which seems reasonable.

betseg

UNIX time 1500000000 will be about on the pi approximation day

ETHproductions

So it's an approximation of pi approximation day?

betseg

21:14

yup

Jan Dvorak

What's so special about 1500000000?

betseg

only special in the base 10 (that number is in base 10 btw)

ETHproductions

Yeah, what's so special about 1011001011010000010111100000000? :P

Phoenix

Right, but a day is 86400 seconds, so you have quite range there, and it's an approximation anyway.

Not that surprising.

ETHproductions

Wait, JS says new Date(1500000000000) (added three extra zeroes because milliseconds) will be July 14, 2017...

betseg

21:23

pi approximation day is 22/7

ETHproductions

Oh, I was going off the American standard of mm/dd

Jan Dvorak

ew

ETHproductions

So I guess it got the 7 right for European Pi Approximation day, and the 14 right for American Pi Approximation day... interesting...

betseg

$ | π - 3.14 | > | π - 22/7 | $, so 22/7 is superior than 14/3

ETHproductions

@JanDvorak We should all just stick to yyyy-mm-dd. Makes sorting by date a lot easier :P

orlp

21:26

@betseg 355/113

betseg

not on calendar

orlp

I always memorize it as 113355 split in two

betseg

1/(113/355)

ETHproductions

It's impossible to make a dd-mm-yy date out of those digits though

11 is the only allowable month, but then 33 is the smallest possible day

orlp

I was just giving a nice rational approximation

I didn't see the date context

betseg

21:31

314159265358979323846/100000000000000000000

Jan Dvorak

7-22 is a good PI approximation

ETHproductions

It's good enough for most purposes, then 355/113 is good enough for a lot of the rest

betseg

ETHproductions

If it was Windows 00 that chart would be lot shorter

Phoenix

21:54

@betseg What is the vertical axis measuring?

betseg

number of windows

ETHproductions

@Phoenix The number related to the release (which is why Windows 2000 is so high)

Phoenix

oic

Welp, my school went and completely blocked GitHub. RIP

ETHproductions

At least you still have SE

Phoenix

yep

betseg

22:04

Welp, my country went and completely blocked Wikipedia. RIP

orlp

@betseg that's what you get when you elect a dictator =/

Dennis

At least you still have GitHub.

betseg

@orlp i didnt

ETHproductions

s/you elect/your country elects/

orlp

'that's what you get' is an idiom not specifically referring to you personally

ETHproductions

22:11

Oh yes, I forgot the "you" is allowed to refer to Turkey

That's what you get when you take things too literally :P

Dennis

That's a standard loophole.

5

ETHproductions

Wow... it took me forever to get the joke

betseg

i didnt mean that too, i meant someone else voted for him and he dictates me.

Conor O'Brien

22:48

@betseg do you know why this doesn't work?

Phoenix

@betseg are you able to access wikiwand.com?

betseg

@ConorO'Brien Try it online! you declared a pointer but it doesnt point to anywhere

Conor O'Brien

wait nvm I need a malloc call

betseg

lol

Conor O'Brien

XD

thanks

betseg

22:55

@Phoenix yep, but i can access wikipedia too. my ISP doesnt hijack DNSs, i can change the DNS i use

Conor O'Brien

sorry to bother you again, but I tried moving the logic to a function and it segfaulted

Sumant Bhaskaruni

ಠ_ಠ

betseg

@ConorO'Brien Try it online!

@SumantBhaskaruni what happened

Conor O'Brien

that is really weird but ok

betseg

¯\_(ツ)_/¯ C

this does the same, just a different syntax

(*c).a == c->a

Conor O'Brien

23:03

thanks!

betseg

23:23

sleeping, bai

Phoenix

23:35

Anyone want to play Contact?

betseg

I want to, but I can't

Too sleepy

ETHproductions

23:48

This question (the one about storage in golfing language, if you've already seen it) seems like it would work better if it's expanded a little to include different types of golfing languages. Obviously the data type is the most critical item if you're trying to decide between creating a stack-based language or a tape-based language, but there's also prefix languages, infix languages, tacit languages, etc.

Storage applies most crucially to stack-based languages, tape-based langs, etc. but how do you describe how Pyth or Jelly stores data (ignoring variables and registers)?

I'd edit this into the question, but a) I'm not sure how to phrase it, and b) I don't know if it's a good idea

Adnan

@Riley Fixed

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